SpringCloud分布式微服务b2b2c电子商务docker-feign配置（六）
这节我们讨论一下feign配置，通过编写配置类，我们可以自定义feign的日志级别，日志扫描目录，可以通过feign调用服务在eureka上的调用信息。
feign声明接口之后，在代码中通过@Resource或者@Autowired注入之后即可使用。
@FeignClient标签的常用属性如下：
name：指定FeignClient的名称，如果项目使用了Ribbon，name属性会作为微服务的名称，用于服务发现了解springcloud架构可以加求求：三五三六二四七二五九
url: url一般用于调试，可以手动指定@FeignClient调用的地址
decode404:当发生http 404错误时，如果该字段位true，会调用decoder进行解码，否则抛出FeignException
configuration: Feign配置类，可以自定义Feign的Encoder、Decoder、LogLevel、Contract
fallback: 定义容错的处理类，当调用远程接口失败或超时时，会调用对应接口的容错逻辑，fallback指定的类必须实现@FeignClient标记的接口
fallbackFactory: 工厂类，用于生成fallback类示例，通过这个属性我们可以实现每个接口通用的容错逻辑，减少重复的代码
path: 定义当前FeignClient的统一前缀
一、创建模块（microservice-consumer-movie-feign-customizing）
项目结构如下：
二、pom.xml文件
xsi:schemaLocation=" http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
microservice-consumer-movie-feign-customizing
jar
UTF-8
UTF-8
1.8
org.springframework.boot
spring-boot-starter-web
org.springframework.cloud
spring-cloud-starter-eureka
org.springframework.boot
spring-boot-starter-actuator
org.springframework.cloud
spring-cloud-starter-feign
com.spotify
docker-maven-plugin
build-image
install
build
http://192.168.6.130:5678
true
${docker.repostory}/${docker.image.prefix}/${project.artifactId}:${project.version}
java:openjdk-8-jdk-alpine
["java", "-jar", "/${project.build.finalName}.jar"]
/
${project.build.directory}
${project.build.finalName}.jar
三、配置文件
spring:
application:
name: microservice-consumer-movie-feign-customizing
server:
port: 7901
eureka:
client:
healthcheck:
enabled: true
serviceUrl:
defaultZone: http://jacky:admin@peer1:8761/eureka/,http://jacky:admin@peer2:8762/eureka/,http://jacky:admin@peer3:8763/eureka/
instance:
prefer-ip-address: true
feign日志配置
logging:
level:
com.jacky.cloud.feign.UserFeignClient: DEBUG
解决第一次请求报超时异常的方案：
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds: 5000 #延长超时时间
或者：
hystrix.command.default.execution.timeout.enabled: false
或者：
feign.hystrix.enabled: false # 索性禁用feign的hystrix支持
超时的issue：https://github.com/spring-cloud/spring-cloud-netflix/issues/768
超时的解决方案： http://stackoverflow.com/questions/27375557/hystrix-command-fails-with-timed-out-and-no-fallback-available
hystrix配置： https://github.com/Netflix/Hystrix/wiki/Configuration#execution.isolation.thread.timeoutInMilliseconds
四、实体类User.java
package com.jacky.cloud.entity;
import java.math.BigDecimal;
public class User {
private Long id;
private String username;
private String name;
private Short age;
private BigDecimal balance;
public Long getId() {
return this.id;
}
public void setId(Long id) {
this.id = id;
}
public String getUsername() {
return this.username;
}
public void setUsername(String username) {
this.username = username;
}
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
public Short getAge() {
return this.age;
}
public void setAge(Short age) {
this.age = age;
}
public BigDecimal getBalance() {
return this.balance;
}
public void setBalance(BigDecimal balance) {
this.balance = balance;
}
}
五、feign客户端1（UserFeignClient1.java）
package com.jacky.cloud.feign;
import org.springframework.cloud.netflix.feign.FeignClient;
import com.jacky.cloud.entity.User;
import com.jacky.config.Configuration1;
import feign.Param;
import feign.RequestLine;
@FeignClient(name = "microservice-provider-user", configuration = Configuration1.class)
public interface UserFeignClient1 {
@RequestLine("GET /simple/{id}")
public User findById(@Param("id") Long id);
}
六、feign客户端2（UserFeignClient2.java）
package com.jacky.cloud.feign;
import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import com.jacky.config.Configuration2;
@FeignClient(name = "xxxx", url = "http://localhost:8761/", configuration = Configuration2.class)
public interface UserFeignClient2 {
@RequestMapping(value = "/eureka/apps/{serviceName}")
public String findServiceInfoFromEurekaByServiceName(@PathVariable("serviceName") String serviceName);
}
八、feign配置类2（Configuration2.java）
package com.jacky.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import feign.auth.BasicAuthRequestInterceptor;
@Configuration
public class Configuration2 {
@Bean
public BasicAuthRequestInterceptor basicAuthRequestInterceptor() {
return new BasicAuthRequestInterceptor("jacky", "admin"); //Eureka添加了安全验证，则需要配置上面的用户名、密码
}
}
九、MovieController.java
package com.jacky.cloud.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import com.jacky.cloud.entity.User;
import com.jacky.cloud.feign.UserFeignClient2;
import com.jacky.cloud.feign.UserFeignClient1;
@RestController
public class MovieController {
@Autowired
private UserFeignClient1 userFeignClient1;
@Autowired
private UserFeignClient2 userfeignClient2;
/**
- 调用生产者服务
- @param id
- @return
*/
@GetMapping("/movie/{id}")
public User findById(@PathVariable Long id) {
return this.userFeignClient1.findById(id);
}
/**
- 获得服务在eureka信息
- @param serviceName
- @return
*/
@GetMapping("/{serviceName}")
public String findServiceInfoFromEurekaByServiceName(@PathVariable String serviceName) {
return this.userfeignClient2.findServiceInfoFromEurekaByServiceName(serviceName);
}
}
十、启动类ConsumerMovieFeignApplication.java
package com.jacky.cloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;
@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients
public class ConsumerMovieFeignApplication {
public static void main(String[] args) {
SpringApplication.run(ConsumerMovieFeignApplication.class, args);
}
}